Vtp Modes And Mode Transitions - Cisco WS-C2955T-12 Software Manual

Using VTP

VTP Modes and Mode Transitions

You can configure a supported switch to be in one of the VTP modes listed in
Table 8-4
VTP Mode
VTP server
VTP client
VTP transparent In this mode, VTP transparent switches do not participate in VTP. A VTP
Two configurations can cause a switch to automatically change its VTP mode:
•
•
The
VTP.
Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
8-10
VTP Modes
Description
In this mode, you can create, modify, and delete VLANs and specify other
configuration parameters (such as VTP version) for the entire VTP domain. VTP
servers advertise their VLAN configurations to other switches in the same VTP
domain and synchronize their VLAN configurations with other switches based on
advertisements received over trunk links.
In VTP server mode, VLAN configurations are saved in nonvolatile RAM. VTP
server is the default mode.
In this mode, a VTP client behaves like a VTP server, but you cannot create, change,
or delete VLANs on a VTP client.
In VTP client mode, VLAN configurations are saved in nonvolatile RAM.
transparent switch does not advertise its VLAN configuration and does not
synchronize its VLAN configuration based on received advertisements. However,
transparent switches do forward VTP advertisements that they receive from other
switches. You can create, modify, and delete VLANs on a switch in VTP transparent
mode.
In VTP transparent mode, VLAN configurations are saved in nonvolatile RAM, but
they are not advertised to other switches.
When the network is configured with more than the maximum 250 VLANs (some models support a
maximum of 64 VLANs), the switch automatically changes from VTP server or client mode to VTP
transparent mode. The switch then operates with the VLAN configuration that preceded the one that
sent it into transparent mode.
When a multi-VLAN port is configured on a supported switch in VTP server mode or client mode,
the switch automatically changes to transparent mode.
"VTP Configuration Guidelines" section on page 8-13
Chapter 8
Table 8-4.
provides tips and caveats for configuring
Configuring VLANs
78-6511-08